Xerox ColorQube 8570 Service Manual page 343

Electronics Module Diagnostic LEDs
The Electronics Module has 2 LEDs for diagnostic and troubleshooting purposes: Power-On
Self Test PS LED and Print Engine Self Test also known as PEST, its status is indicated with
the PE LED. These LEDs display self-diagnostic fault codes. Go to
Chapter 2 (Fault Messages and Codes) for troubleshooting fault codes on these LEDs.
Figure 4 Main Controller Board LEDs (right side view)
Figure 5 Main Controller Board LEDs
Xerox Internal Use Only - Revised, 3rd Revision
ColorQube 8570/8870 Service Manual
I/O Board LED
The I/O Board has one LED. The green LED indicates +3.3V is provided. This LED acts in a
similar manner to the +3.3V power LED in the Electronics Module.
Power On Self Tests in
October 2012
6-29
Figure 6 I/O Board LED
General Troubleshooting
Electrical Troubleshooting